Fix SPI to agree with SPI standards, and allow it to run at higher speeds.
Fix SPI to agree with SPI standards, and allow it to run at higher speeds.

ricklon/chipKIT-core,pontech/chipKIT-core,adamwolf/chipKIT-core,chipKIT32/chipkit-core,chipKIT32/chipkit-core,EmbeddedMan/chipKIT-core,pontech/chipKIT-core,adamwolf/chipKIT-core,chipKIT32/chipkit-core,adamwolf/chipKIT-core,ricklon/chipKIT-core,pontech/chipKIT-core,adamwolf/chipKIT-core,EmbeddedMan/chipKIT-core,pontech/chipKIT-core,adamwolf/chipKIT-core,chipKIT32/chipkit-core,EmbeddedMan/chipKIT-core,majenkotech/chipKIT-core,majenkotech/chipKIT-core,chipKIT32/chipkit-core,EmbeddedMan/chipKIT-core,majenkotech/chipKIT-core,ricklon/chipKIT-core,adamwolf/chipKIT-core,EmbeddedMan/chipKIT-core,adamwolf/chipKIT-core,EmbeddedMan/chipKIT-core,pontech/chipKIT-core,pontech/chipKIT-core,ricklon/chipKIT-core,majenkotech/chipKIT-core,ricklon/chipKIT-core,majenkotech/chipKIT-core,majenkotech/chipKIT-core,ricklon/chipKIT-core,majenkotech/chipKIT-core,pontech/chipKIT-core,EmbeddedMan/chipKIT-core